US2504999A - Electric signaling system - Google Patents

Electric signaling system Download PDF

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US2504999A
US2504999A US744009A US74400947A US2504999A US 2504999 A US2504999 A US 2504999A US 744009 A US744009 A US 744009A US 74400947 A US74400947 A US 74400947A US 2504999 A US2504999 A US 2504999A
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tube
tubes
conducting
contacts
code
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Mcwhirter Eric Malcolm Swift
Dunn Roland Harris
Lennox Peter William
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International Standard Electric Corp
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International Standard Electric Corp
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C15/00—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path
    • G08C15/06—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division
    • G08C15/12—Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path successively, i.e. using time division the signals being represented by pulse characteristics in transmission link

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  • This invention relates to electric signalling systerns. There are many arrangements in which it is required to exercise at a control station continuous supervision of the readings of meters at a sub-station. It is generally impracticable to allot aseparate channel of transmission for each meter and it is one object of the present invention to provide an electric signalling system by means of which signals representative of the readings of a plurality oimeters may be sent over a signalling channel in such a way as "to be readily separable at a supervisory station for actuation of devices individual to each meter.
  • the invention is an electric signalling system comprising a plurality of meters, contacts individual to each meter, means for actuating the respective contacts each time a unit of the quantity being metered has been accumulated, means operative upon actuation of any contact to transmit over a signalling channel a code signal characteristic of the particular contact, and means at the receiving end of said channel and operative upon the receipt of said characteristic code signal for actuating a device individual to said contacts.
  • the invention may be applied to the remote indication of the readings of a plurality of kilowatt-hour meters situated at one or more electric power substat ons. each meter closing contacts individual to the meter each time the rotating parts complete one revolution, and operating corresponding meters at a main or supervisory station over a common signalling channel. Other examples of meters which close contacts each time a unit of the quantity being metered has been accumulated are described in two co-pending applications of E. M. S. McWhirter and R.
  • code combinations of marking and spacing elements are well known in the teleprinter art.
  • the number of elements in the code combination need be only suflicient to provide a separate code combination for each contact but in the interests of general flexibility of the system it is preferred to use a start-stop telelprinter code, the elements of which are sent successively.
  • This means may take the form of a distributor having a position corresponding to each of the contacts and this form of the invention is applicable to other systems than those for the remote .supervision of meter readings.
  • an electric signalling system comprising a plurality of contacts, a continuously operable distributor having a position corresponding to each of said contacts, means operable upon said distributor reaching a position corresponding to contacts that have been actuated to stop the operation of said distributor, to cause the transmission of a signalling code individual to said contacts, and means operable upon the conclusion of said transmission to cause the resumption of the operation of said distributor.
  • an electric signalling system comprising a plurality of contacts, a plurality of gas-filled electric discharge devices connected in a closed chain, one corresponding to e ch of said contacts, means for rendering the said devices conducting sequentially, means operable upon actuation of one of said contacts for registering temporarily said actuation, means operable when said actuation has been registered and when the corresponding device has become conducting to prevent the next device in the chain from becoming conducting and to cau e the tr nsmission of a signalling code individual to said ontacts and means operable upon the conclusion of said transmission to cause the n xt device in said chain to become conducting and. to effect the resumption of the action of said means for rendering the said devices conducting seouentiallv.
  • Fig. 1 is a block schematic diagram of the arrangements at a sub-station
  • Fig. 2 is a detailed circuit diagram of enough of the arrangements of Fig. l to enable the operations to be followed in detail.
  • Fig. 3 shows one form of impulse source at the transmitter
  • Fig. gi shows diagrammatically the arrangements at the supervisory station ior' operating indicators in accordance with particular received telegraph codes.
  • Fig. shows diagrammatically one arrangement of an electric signalling system according to the invention when signalling takes place from twosubstations to a common supervisory station.
  • Fig. 1 shows the manner in which the component parts of a transmitting arrangement according to the invention are arranged.
  • Meter contacts- 2, 3 and l are shown in the form of changeover contacts. These contacts are normally in the position shown, but when any meter has accumulated a quantity which is to be indicated to a supervisor the contacts change over to the alternative position.
  • Associated with the meter contacts are corresponding storage devices 5 8, which temporarily store an indication that the contacts have changed over to the alternative position.
  • the storage devices are associated with corresponding code transmitters 9 l2.
  • code transmitters 9 l2 Four meter contacts only with their corresponding storage devices and code transmitters have been shown since the operation of the arrangement will be clear therefrom but any number may be provided within limits determined by the maximum rate of actuation of the meter contacts.
  • This distributor has a position corresponding to each code transmitter.
  • This distributor consists of a closed chain of three-electrode gas filled tubes each tube corresponding to a position.
  • the tubes corresponding to the code transmitters 9 l2 are shown at l3 l3 respectively.
  • 2 also consists of an unclosed chain of three-electrode gas filled tubes.
  • Each code combination to be transmitted is a start-stop teleprinter code combination consisting of a start element, flve code elements and a stop element.
  • In each transmitter there are seven tubes one for each element of the code and the anodes of the several tubes are connected to positive potential over either the marking or the spacing winding of a polarised telegraph relay H, the contacts ll of which connect either marking or spacing potential accordingly to a line l9. Since only one code is transmitted at a time, the relay I1 is common to all the transmitters.
  • the connections of the anodes of the tubes in any particular transmitter to the marking and spacing windings of relay I! are pre-set in accordance with a particular code combination, which has been allotted to the contacts associated with the transmitter.
  • the anode of the first tube is, however, always connected to the spacing winding and the anode of the last tube to the marking winding corresponding to the start and stop elements respectively of the teleprinter code combination.
  • the anodes of the tubes in code transmitter 9 corresponding to contacts l are shown connected to the windings of relay II in the order space:-(corresponding to the start element) mark, space, space mark, space and mark (corresponding to the stop element).
  • the anodes of the tubes in transmitter III are connected to the windings of relay I!
  • 6 of the distributor are '3 caused to be operated sequentially in that order from an impulse source 20, which is connected over a conductor 2
  • the impulse source 20 is also connected over a conductor '22 to all the tubes of all the code transmitters. Impulses are supplied to leads 2
  • the operation of the circuit of Fig. 1 is in outline as follows.
  • the tubes l3 IQ of the distributor normally become conducting in sequence and form a closed chain.
  • the connection of one tube to the next is such that when one tube becomes condueting a positive bias is applied to the next tube.
  • This positive bias is insufllcient to cause this next tube to become conducting until an impulse is applied over conductor 2
  • This impulse is applied to all the tubes in the distributor chain and is insumcient by itself to cause any tube to become conducting.
  • 3 IS in the distributor chain also tends, when conducting, to apply a bias to the start tube of the corresponding code transmitter.
  • the nature of the connecting arrangements between these last mentioned tubes is such that this bias is normally ineffective upon the start tube even when a pulse is applied over conductor '22 to the control electrode of the start tube.
  • the input connections to the start tube of the corresponding transmitter are modified and the bias applied by a distributor tube becomes effective upon the start tube. This bias is, however, even then ineflective until the effect of an impulse from the conductor 22 is added thereto.
  • occur at 20 millisecond intervals and the impulses applied to conductor 22 occur also at 20 millisecond intervals but each impulse on conductor 22 occurs midway between two impulses on conductor 2
  • 2 becomes conducting at an interval 0! 10 milliseconds thereafter.
  • the anode circuits of all tubes in the distributor and in the code transmitters are so interconnected that upon one tube becoming conducting, any tube that is previously conducting is rendered non-conducting and consequently the distributor tube becomes non-conducting.
  • the effect of the start tube becoming conducting is also to wipe out the storage oi. the contact chan eover.
  • the tubes 01 the code transmitter then become conducting in turn and operate the transmitting relay I] in the appropriate manner to send the specified code combination by means of its contacts l8 over line i8.
  • each code transmitter is connected over a conductor 23, 24, 25 or 28 to the distributor tube l4, l5, It or l3 next in the chain in a manner similar to that in which adjacent tubes in either the code transmitter or .the distributor are interconnected, so that when the stop tube becomes conducting it applies a bias to the distributor tube which bias is suilicient, together with that derived from an impulse over conductor 2
  • the stop tube in the code transmitter becomes non-conducting and the operation of the distributor is resumed.
  • contacts I. of relay II have been shown connected to a line IQ for transmission of direct current, double current signal elements or any other well known means of transmitting teleprinter signals over a signalling channel of any type may be used.
  • Fig. 2 shows the code transmitter l2, the corresponding storage device 8 and contacts 4 and three tubes I6, I 5 and i3 of the distributor of Fig. 1.
  • each tube is a three-electrode, gas-filled tube, having a cold cathode, a control electrode and an anode.
  • the control electrode and the cathode are shown similarly, the cathode being the right hand electrode of the pair in the case of all tubes in the code transmitter l2 and the storage device 8 and the upper electrode of the pair in the case of the tubes in the distributor.
  • Each tube is connected to the following tube in the chain in the same manner.
  • the connections are similar to those shown in U. S. Patent No. 2,421,005, issued May 2'7, 1947, to F. H. Bray and L. R. Brown, but modified in order to improve the sequential operation of a series of tubes.
  • the general manner of operation of a chain of tubes connected in this way is well-known but as this manner of operation is fundamental to the embodiment of the invention being described, a brief explanation will be given here.
  • Tube 21 comprises an anode 28, a control electrode 29 and a cold cathode 30.
  • a positive potential must be applied to the anode 28 with respect to the cathodes. So long as this potential is 130 volts or more, the minimum ionisation current produced by a voltage of about '10 volts between control electrode 29'and cathode 30 is sufficient to cause current to flow between anode 28 and cathode 30.
  • the potential applied between anode and cathode diminishes below 130 volts, the ionisation current between control electrode and cathode, and consequently the potential applied between them that is needed to render the tube conducting, increases rapidly.
  • Resistances 34 and 35 are equal and thus a potential of about 35 volts is' impressed between control electrode 29 and cathode 30 of tube 28. This potential of 35 volts is insufllcient to ionise the gap between these two electrodes. It is to be noted that resistances 34 and 35 are shunted bya condenser 36 which delays the rise in voltage across the resistance 34 and 35 upon tube 3
  • Impulses are applied between conductor 22 and ground at intervals of 20 milliseconds and are of such polarity as to impress a potential of about 35 volts between the control electrode 29 of tube 21 and its cathode 30. This potential added to the potential across resistance 35 is sufficient to ionise the gap between control electrode 29 and cathode 30 of tube 21. As the anode 28 of tube 21 is at a potential of at least 130 volts with respect to the cathode 30, tube 21 becomes conducting.
  • the control electrodes of all the tubes in the code transmitter l2 are similarly connected to impulse conductor 22 but the voltage impressed on the control electrodes of tubes other than tube 21 by an impulse is insufficient by itself to ionise the gap between control electrode and cathode. This happens only with tube 21 because in the case of that tube the voltage due to the impulse on conductor 22 is added to the voltage already impressed between control electrode and cathode from the circuit of the preceding tube 3
  • rectifier 43 and resistance 44 The junction point between rectifier 43 and resistance 44 is connected over a resistance to the control electrode of tube 3
  • the reverse resistance of rectifier 43 is about 20 megohms, and resistances 44 and 45 together are about /2 megohm.
  • is therefore only a few volts, and is insufllcient to cause tube 3
  • meter contacts 4 corresponding to code transmitter l2 have changed over, conditions are altered. Normally contacts 4 are in the left hand position and a tube 43 in storage device 8 is conducting, the flow .of current therethrough serving to charge a condenser 41 over contacts 4. When contacts 4 change over, condenser 41 is discharged through the primary of a step-up transformer 48, and the consequent impulse of current through the secondary of the transformer impresses sufiicient potential between control electrode and cathode of a tube 49 to cause that tube to become conducting.
  • the current through tube 49 passes through resistances 5
  • the resistance of rectifier 43 in the forward direction is about 30,000 ohms so that resistance 44 is large with respect thereto and the potential at the junction point between resistance 44 and rectifier 43, due to the current in tube 49, is only a few volts. If therefore, tube I6 were not conducting, the fact that tube 49 is conducting would be insuiilcient to cause tube 3
  • both tubes l6 and 49 being conducting is to cause the control gap of tube 3
  • Tube I5 becomes non-conducting because tube l3 receives a potential on its control electrode over the lead from the cathode of tube It, tube
  • tube It In addition to initiating the discharge of tube 3, tube It also serves to place a potential on the control electrode of tube 3
  • the cathode of the last tube 52 in the code transmitter I2 is connected to the control electrode of tube l3 which is the tube in the distributor following tube It in the chain.
  • control electrode of tube I3 As the control electrode of tube I3 is connected to the cathode of tube l5, there are two paths in parallel for the current from the cathode of tube 52 to ground, viz. through resistance 53 to ground and through resistances 4
  • each tube in the distributor chain is connected to the following tube in the chain in a manner which difiers slightly from that in which a tube in the code transmitter I2 is connected to the next following tube therein.
  • a point midway of the resistance between a cathode of the tube and earth is connected to the control electrode of the next tube, whereas in the case of the distributor chain, the cathode of one tube is connected directly to the control electrode of the following tube, thus giving the full potential of 35 volts to the grid of the succeeding tube in the chain.
  • 3 Upon the occurrence of an impulse on conductor 2
  • tube l3 will remain conducting for 10 milliseconds only thus completing the 20 minisecond stopperiod for the teleprinter code corresponding, and at the end of this period the start tube for the code transmitter associated with meter contacts will become conducting and the appropriate teleprinter code is transmitted. If the meter contacts associated with tube I3 have not changed over, the regular operation of the distributor is resumed and tube l3 remains conducting for a period of 20 milliseconds.
  • FIG. 3 shows the details of the impulse source 20 of Fig. 1.
  • This is a multivibrator consisting of two similar pentodes (high vacuum tubes) 54 and 55 connected together in wellknown manner, the current supply thereto being stabilised by a gas-filled tube 56.
  • the two control grids are connected to a point on a potentiometer 51 which point is adjustable for adjustment of the frequency of the operation of the device.
  • the grids of the pentodes 54 and 55 are connected to the grids of high vacuum triodes 58 and 59 respectively, through respective condensers 58a and 59a, the conductors 2
  • the variations of potential on the grids of the pentodes 54 and 55 are thus differentiated to produce sharp positive pulses on conductors 2
  • the line l9 ends in two polarised telegraph relays 60 and 6
  • the equipment, at the supervisory station comprises five cold-cathode gas filled tubes 64 68. Of these tube 64 is associated with a pilot train of gas filled tubes 69 for marking ofi the intervals of the teleprinter code.
  • the other tubes 65 68 are provided in number equal to the number of code receivers Ill 13 required, four being shown corresponding to the respective code transmitters
  • the tubes 84 68 are normally conducting and the cathode of tube 64 is connected over conductor 14 to the marking contacts 83 and thus to a condenser 15 which is thus in charged condition.
  • the code receivers have associated therewith relays l9 82, respectively, whichare energized when 9. corresponding code receiver responds to its code.
  • Indicators 83 86 are respectively associated with the said relays and are adapted to indicate upon the operation of a corresponding relay. Operation of theindicators is controlled by the relay armatures 81 90, which armatures are respectively associated with relays l9 82.
  • contacts 63 cause the discharge of condenser 15 to start up an impulse source 16 capable of delivering impulses at predetermined intervals and which supplies an impulse immediately over conductor I1 and thereafter impulses at 30 millisecond intervals and supplies an impulse to conductor 18 after an interval of 10 milliseconds and thereafter impulses over that conductor at intervals of 20 milliseconds.
  • Conductor I8 is connected over contacts 62 to the control electrodes of three-electrode gas filled tubes in the code receivers Ill 13 in accordance with the codes individual thereto. If a code individual to a particular receiver is received that receiver causes the operation of a corresponding relay l9 82, which operates its contacts for a given short period of time and causes the actuation of a corresponding indicator 83 86.
  • the pilot train '69 counts the number of elements to be received and after receipt of the last code element biases the tubes 64 68 so that on the occurrence of the next impulse over conductor ll these tubes become conducting and other tubes are caused to be non-conducting.
  • the impulse source 16 is also brought to a standstill.
  • the diagram of Fig. 4 shows the principle upon which the receiver acts, but in practice considerable simplification may be effected.
  • the code receivers 18 13 are trains of three-electrode gas-filled tubes and some of these tubes may be made common to more than one receiver. Thus Only one tube is needed for the start element and may be made common to the four receivers, and the codes used may be chosen so that the greatest possible number of code elements is common to all the codes used. Thus the four codes used commence with a common combination of the first three code elements; mark, space, space, and tubes arranged to respond in succession to these successive elements may be common to'all four receivers.
  • Fig. 5 shows diagrammatically how the operation of contacts situated some at one sub-station and some at another may operate corresponding indicators at the same supervisory station.
  • are contacts 2, 3, 4, which by means of the operations previously described transmit distinctive codes toa receiver 92 at another substation 93 and operate contacts 81, 88, 89 and 90 thereat.
  • At substation 93 are also contacts 94 and 95 operation of which is to be indicated at a main station.
  • a distributor 96 having positions corresponding to the respective contacts 81, 88, 89, 98, 94, 95 and also corresponding code transmitters (not shown) whereby operation of any one of the contacts is signalled to the supervisory station 91 and by means of the operations previously outlined individual irdilcators 83, 84, 85, 86, 98, 99 are selectively Opera e What. is claimed is:
  • Electric signalling system comprising a plurality of contacts, a plurality of gas-filled electric discharge devices connected in a closed chain, one corresponding to each of said contacts, means for rendering the said devices conducting sequentially, means operable upon actuation of one of said contacts for registering temporarily said actuation, means operable when said actuation has been registered and when the corresponding device has become conducting to prevent the next device in the chain from becoming conducting and to cause the transmission of a signalling code individual to said contacts and means operable upon the conclusion of said transmission to cause the next device in said chain to become conduct- 7 ing and to effect the resumption of the action of said meansfor rendering the said devices conducting sequentially.
  • said means for registering temporarily the actuation of said contacts comprises a three-electrode gas-filled tube and means for rendering said tube conducting upon actuation of said contacts.
  • Electric signalling system comprising a plurality of changeover contacts, a transmitter adapted to transmit a characteristic teleprinter code a storage device consisting of two'threeelectrode cold cathode tubes associated with each 01 said contacts, one of said tubes being conducting in normal .position of the corresponding contacts, means operative upon changeover of said contacts to render the other of said tubes of the corresponding storage device conducting, means operative upon the last mentioned of said tubes in said storage device becoming conducting to prepare said transmitter for operation and a distributor for causing the transmission in succession of teleprinter codes corresponding to contacts that have been actuated.
  • said transmitter comprises a plurality of three-electrode gas-filled tubes, one for each element of the code to be transmitted, and means for rendering said tubes conducting sequentially to time the transmission of the corresponding elements of the code.
  • Electric signalling system comprising a plurality of contacts, a corresponding plurality of pairs of three-electrode cold cathode tubes, a first tube of each pair being normally conducting, means operable upon actuation of one of said contacts to cause the second tube of the corresponding pair to become conducting and to cause the said first tube of the pair to become non-conducting, a distributor in the form of a closed chain of three-electrode cold cathode tubes (one for each of said contacts) and means for applying pulses to said distributor tubes to cause them to become conducting sequentially, a transmitting three-electrode cold cathode tube, connections between one of the tubes of said distributor and said transmitting tube and between the second tube of one of said pairs and said transmitting tube whereby when both said distributor tube and said second tube of the pair are conducting said transmitting tube may become conducting upon the occurrence of an impulse, means for supplying impulses to said transmitting tube intermediate in time to the impulses applied to said distributor connections between said transmitting tube and the tubes of said distributor whereby when
  • Electric signalling system as claimed in claim 5 comprising a first resistance path to earth from the cathode of a distributor tube, a second resistance path to earth from the cathode of the second tube of one of said pairs of tubes, a connection between corresponding points on said resistance paths including a rectifier and a resistance low compared with the backward resistance of said rectifier but high compared with the forward resistance or the rectifier, and
  • An electric impulse generator comprising a plurality of gas-filled tubes each having a pair of main electrodes and an auxiliary electrode, a source of power connected across said main electrodes, circuit means connecting certain of said tubes in a closed chain, other circuit means connecting the remaining tubes in a plurality of unclosed chains, the tubes of each of said unclosed chains being connected in cascade between a respective pair of successive tubes of said closed chain, pulse generator means adapted to apply a first train of pulses to the auxiliary electrodes of all the tubes of said closed chain simultaneously and further adapted to apply a second train of pulses to the auxiliary electrodes of all of said remaining tubes simultaneously, biasing means for said auxiliary electrodes, respectively, each of said biasing means including an impedance in series with one of the main electrodes of the tube immediately preceding, the pulses of said first train being of such magnitude and polarity as to effect ionization of a tube when a tube immediately preceding the same is energized, switch-over means for each of said unclosed chains, respectively, each of said
  • said signaling means comprises a relay having two windings, said relay being adapted to transmit marking and spacing impulses according to which of said windings is energized, each tube of said unclosed chains being connected to said source of power by way of one or the other of said windings whereby successive ionization of the tubes of any unclosed chain will result in the generation of a code pattern of impulses characteristic of the particular unclosed chain.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Time-Division Multiplex Systems (AREA)
US744009A 1946-02-19 1947-04-25 Electric signaling system Expired - Lifetime US2504999A (en)

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GB5152/46A GB636667A (en) 1946-02-19 1946-02-19 Improvements in or relating to electric signalling systems

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ES (1) ES177685A1 (fr)
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GB (1) GB636667A (fr)

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US2629088A (en) * 1950-09-30 1953-02-17 Gen Railway Signal Co Centralized traffic controlling system for railroads
US2905760A (en) * 1955-03-30 1959-09-22 Rca Corp Multiplex communication system
US2918654A (en) * 1955-12-29 1959-12-22 Stromberg Time Corp Automatic information transmission
US2932016A (en) * 1954-12-24 1960-04-05 Dayonnet Francois Jacque Denis Apparatus for simultaneous reading of a plurality of curves
US2968694A (en) * 1957-06-25 1961-01-17 Bell Telephone Labor Inc Code signal programmer
US3001182A (en) * 1957-10-01 1961-09-19 Westinghouse Air Brake Co Coordination circuits for remote control and indication systems
US3007136A (en) * 1959-04-13 1961-10-31 Gen Dynamics Corp Non-resetting allotter device
US3056956A (en) * 1954-11-05 1962-10-02 Gen Precision Inc Analog-digital converter
US3059228A (en) * 1959-10-26 1962-10-16 Packard Bell Comp Corp Multiplexing sample and hold circuit
US3063036A (en) * 1958-09-08 1962-11-06 Honeywell Regulator Co Information handling apparatus
US3069656A (en) * 1957-10-14 1962-12-18 Sun Oil Co Remote reading apparatus
US3129286A (en) * 1961-01-23 1964-04-14 Stelma Inc Signal distortion analyzer
US3133267A (en) * 1960-02-12 1964-05-12 Westinghouse Brake & Signal Remote control systems having scanning cycle bypass means
US3166735A (en) * 1958-10-06 1965-01-19 Gen Electric Code selectors for selective calling systems
US3174132A (en) * 1960-12-12 1965-03-16 Ibm Keyboard controlled signal transmitter for multiplex system
US3197741A (en) * 1959-09-17 1965-07-27 Hancock Telecontrol Corp Means for recording registered data
US3214733A (en) * 1960-12-23 1965-10-26 Ibm Data multiplexing apparatus
US3234534A (en) * 1961-12-04 1966-02-08 Rank Bush Murphy Ltd Fault alarm display systems
US3243800A (en) * 1963-03-29 1966-03-29 Smith Corp A O Pulse separating and transmitting circuit
US3246131A (en) * 1961-12-26 1966-04-12 Phillips Petroleum Co Computer data collection system
US3277456A (en) * 1962-03-09 1966-10-04 Shell Oil Co Sequential transmission of randomly occurring events
US3335404A (en) * 1962-07-07 1967-08-08 Ferranti Ltd Continuous monitor and binary chain code transmitter and receiver system
US3361875A (en) * 1964-07-10 1968-01-02 Computing Devices Canada Apparatus for generating a telegraph signal
US3365700A (en) * 1962-02-05 1968-01-23 Cortner Jr Telemetering inventory system
US3380023A (en) * 1964-01-21 1968-04-23 Motorola Inc Electronic alarm system
US3491355A (en) * 1966-01-24 1970-01-20 Us Navy Automatic data sequencer
US4717912A (en) * 1982-10-07 1988-01-05 Advanced Micro Devices, Inc. Apparatus for producing any one of a plurality of signals at a single output

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US2302535A (en) * 1940-04-05 1942-11-17 Holtzer Cabot Electric Co Paging system
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US2372593A (en) * 1941-07-17 1945-03-27 Int Standard Electric Corp Telemetering system
US2381920A (en) * 1944-02-17 1945-08-14 Bell Telephone Labor Inc Telemetric device
US2403890A (en) * 1943-08-24 1946-07-09 Hazeltine Research Inc Telemetering system
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US2317995A (en) * 1931-01-22 1943-05-04 Teletype Corp Selective signaling system and apparatus
US2207743A (en) * 1935-12-31 1940-07-16 Teletype Corp Telegraphic transmission and automatic printing of meter readings
US2207744A (en) * 1935-12-31 1940-07-16 Teletype Corp Coding mechanism
US2302535A (en) * 1940-04-05 1942-11-17 Holtzer Cabot Electric Co Paging system
US2372593A (en) * 1941-07-17 1945-03-27 Int Standard Electric Corp Telemetering system
US2428089A (en) * 1943-02-25 1947-09-30 Ncr Co Communication system
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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2629088A (en) * 1950-09-30 1953-02-17 Gen Railway Signal Co Centralized traffic controlling system for railroads
US3056956A (en) * 1954-11-05 1962-10-02 Gen Precision Inc Analog-digital converter
US2932016A (en) * 1954-12-24 1960-04-05 Dayonnet Francois Jacque Denis Apparatus for simultaneous reading of a plurality of curves
US2905760A (en) * 1955-03-30 1959-09-22 Rca Corp Multiplex communication system
US2918654A (en) * 1955-12-29 1959-12-22 Stromberg Time Corp Automatic information transmission
US2968694A (en) * 1957-06-25 1961-01-17 Bell Telephone Labor Inc Code signal programmer
US3001182A (en) * 1957-10-01 1961-09-19 Westinghouse Air Brake Co Coordination circuits for remote control and indication systems
US3069656A (en) * 1957-10-14 1962-12-18 Sun Oil Co Remote reading apparatus
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Also Published As

Publication number Publication date
GB636667A (en) 1950-05-03
BE471305A (fr) 1947-08-19
ES177685A1 (es) 1947-06-01
FR941962A (fr) 1949-01-26

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